A method of preparing a fluid-structure interactive numerical model, for preparing, when an actual structure as a living organism performs a prescribed motion in a fluid, a numerical model related to said fluid and a numerical model related to said structure, comprising:
- actual structure measuring step of measuring physical values related to an actual structure of said structure;
- the step of preparing equivalent numerical model of actual structure that can be regarded as equivalent to said actual structure, in which the physical values related to said actual structure measured in said actual structure measuring step are given as numerical values;
- manner of motion measuring step causing said actual structure make a prescribed motion and measuring physical values related to a manner of said prescribed motion;
- motion model preparing step of preparing a motion model in which the physical values related to said manner of prescribed motion are given as numerical values;
- and
- fluid-structure interactive analysis step of calculating, when said equivalent numerical model of actual structure performs said prescribed motion represented by said motion model in a pre-set virtual fluid for analysis, a numerical model related to the fluid of said virtual fluid (numerical fluid model) and a numerical model related to the structure of said equivalent numerical model of actual structure, by performing fluid-structure interactive analysis in which behavior of said fluid and behavior of said structure are given as numerical models including interaction therebetween.